I had two attempted colonoscopies by two different providers. Neither could get beyond a small distance of the sigmoid. This was following a single/first time occurrence of diverticulitis this past May. I had an abscess, perforated colon and was hospitalized for 5 days. I am having robotic surgery on 1/22. I completely understand your reluctance/concern. It is very hard to undergo major surgery when you feel fine. In my case the diverticulitis caused a stricture/scar tissue.